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The reaction between mononuclear [ Ln (bbpen)Cl] [ Ln = Gd or Dy; H 2 bbpen = N , N '-bis-(2-hy-droxy-benz-yl)- N , N '-bis-(pyridin-2-ylmeth-yl)ethyl-enedi-amine, C 28 H 30 N 4 O 2 ] and potassium oxalate monohydrate in water/methanol produced the solvated centrosymmetric isostructural binuclear (μ-oxalato)bis-{[ N , N '-bis-(2-oxidobenzyl-κ O )- N , N '-bis-(pyridin-2-ylmethyl-κ N )ethyl-enedi-amine-κ 2  N , N ']dilanthanide(III)}-methanol-water (1/4/4) complexes, [ Ln  2 (C 28 H 28 N 4 O 2 ) 2 (C 2 O 4 )]·4CH 3 OH·4H 2 O, with lanthanide(III) = gadolinium(III) ( Ln = Gd) and dysprosium(III) ( Ln = Dy), in high yields ( ca 70%) directly from the reaction mixtures. In both complexes, the lanthanide ion is eight-coordinate and adopts a distorted square-anti-prismatic coordination environment. The triclinic ( P ) unit cell contains one dimeric unit together with four water and four methanol mol-ecules; in the final structural model, two of each type of solvating mol-ecule refine well. In each lanthanide(III) dimeric mol-ecule, the medium-strength O⋯H-O hydrogen-bonding pattern involves four oxygen atoms, two of them from the phenolate groups that are 'bridged' by one water and one methanol mol-ecule. These inter-actions seem to contribute to the stabilization of the relatively compact shape of the dimer. Electron densities associated with an additional water and methanol mol-ecule were removed with the SQUEEZE procedure in PLATON [Spek (2015 ▸). Acta Cryst. C 71 , 9-18]. These two new compounds are of inter-est with respect to magnetic properties.

acta crystallographica. section e, crystallographic communications

Crystal structures of binuclear complexes of gadolinium(III) and dysprosium(III) with oxalate bridges and chelating N,N′-bis(2-oxidobenzyl)-N,N′-bis(pyridin-2-ylmethyl)ethylenediamine (bbpen2−)